1984 OMC 3.0 - Compression Test Question

R

Randal McSandal

Cadet
Joined
May 21, 2013
Messages
11
I've read in the stickies and done some searching on compression tests, I know that the ignition needs to be disabled during this.
I plan on warming the engine up, pulling the plugs & taking them out of the wires, then attaching the gauge to each cylinder and cranking it with the key, but how do I ground the coil/distributor wire? I'd like to not goof anything up!

Sorry to request a step by step but I'm not clear on the disabling of the ignition.

Boat is an 84 searay seville.

Thanks in advance!

photo 3.jpgphoto 2.jpg
 
Bondo

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,506
Re: 1984 OMC 3.0 - Compression Test Question

Randal McSandal said:
I've read in the stickies and done some searching on compression tests, I know that the ignition needs to be disabled during this.
I plan on warming the engine up, pulling the plugs & taking them out of the wires, then attaching the gauge to each cylinder and cranking it with the key, but how do I ground the coil/distributor wire? I'd like to not goof anything up!

Sorry to request a step by step but I'm not clear on the disabling of the ignition.

Boat is an 84 searay seville.

Thanks in advance!
Click to expand...

Ayuh,.... Welcome Aboard,... 1 Easy way is to remove the wires from the (+) terminal of the coil....
Or,..
Pull the coil hi-tension lead from the distributor, 'n ground it out on the block...
 
A

aerobat

Master Chief Petty Officer
Joined
Jun 1, 2011
Messages
835
Re: 1984 OMC 3.0 - Compression Test Question

and do not forget to apply full throttle when checking compression
 
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